JEE Questions for Chemistry Solutions Quiz 7 - MCQExams.com

In an osmotic pressure measurement experiment, a 5% solution of compound 'X ' is found to be isotonic with a 2% acetic acid solution. The gram molecular mass of 'X ' is
  • 24
  • 60
  • 150
  • 300
The vapour pressure of water at 23°C is 19.8 mm. 0.1 mole of glucose is dissolved in 178.2 g of water. What is the vapour pressure (in mm) of the resultant solution ?
  • 19.0
  • 19.602
  • 19.402
  • 19.202
MX2 dissociates into M2+ and X - ions in an aqueous solution with a degree of dissociation (α) of 0.5 . The ratio of observed depression of freezing point of the aqueous solution to value of the depression of freezing point in the absence of ionic dissociation.
  • 1
  • 2
  • 3
  • 4
If in a solvent, n simple molecules of solute combine to form an associated molecule, α is the degree of association, the van't Hoff factor is equal to

  • Chemistry-Solutions-7040.png
  • 2)
    Chemistry-Solutions-7041.png

  • Chemistry-Solutions-7042.png

  • Chemistry-Solutions-7043.png
The degree of dissociation (α) of a weak electrolyte, Ax By is related to van't Hoff factor (i) by the expression

  • Chemistry-Solutions-7044.png
  • 2)
    Chemistry-Solutions-7045.png

  • Chemistry-Solutions-7046.png

  • Chemistry-Solutions-7047.png
If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water ( ∆Tf ), when 0.01 mole of sodium sulphate is dissolved in 1 kg of water, is ( Kf = 1.86 Kkg mol-1 )
  • 0.0372 K
  • 0.0558 K
  • 0.0744 L
  • 0.0186 K
Osmotic pressure observed when benzoic acid is dissolved in benzene is less than that expected from theoretical considerations. This is because
  • benzoic acid is an organic solute
  • benzoic acid has higher molar mass than benzene
  • benzoic acid gets associated in benzene
  • benzoic acid gets dissociated in benzene
When 20 g of naphthoic acid (C11 H8O2 ) is dissolved in 50 g of benzene (Kf =1.72 K kg mol-1 ), a freezing point depression of 2 K is observed. The van't Hoff factor (i) is
  • 0.5
  • 1
  • 2
  • 3
Observe the following abbreviations πobs = observed colligative property, πcal = theoretical colligative property assuming normal behaviour of solute. van't Hoff factor (i) is given by

  • Chemistry-Solutions-7049.png
  • 2)
    Chemistry-Solutions-7050.png

  • Chemistry-Solutions-7051.png

  • Chemistry-Solutions-7052.png
The elevation in boiling point of a solution of 13.44 g of CuCl2 in 1 kg of water using the following information will be (molecular weight of CuCl2 =134.4 and kb = 0.52 Km-1 )
  • 0.16
  • 0.05
  • 0.1
  • 0.2
One gram of silver gets distributed between 10 cm3 of molten zinc and 100 cm3 of molten lead at 800°C. The percentage of silver still left in the lead layer in approximately. Distributed coefficient = 300
  • 2
  • 5
  • 3
  • 1
Which of the following correctly represents Henry’s law?
  • m = kHp
  • xA = kHpA
  • pA = kHxA
  • All of these
In liquid CCl4, which of the following has maximum solubility?
  • Cl2
  • Br2
  • I2
  • NaCl
For an aqueous solution of the same solute
  • 1M = 1m
  • 1M > 1m
  • 1m > 1M
  • Any of these is possible
Blood has been found to be isotonic with
  • Conc. NaCl solution
  • Very dil. NaCl solution
  • Normal saline solution
  • Saturated NaCl solution
Molal elevation constant and molal depression constant for water respectively (in oC/m) are
  • 0.52, 1.86
  • 1.86, 0.52
  • 1.52, 0.86
  • 0.86, 1.52
The depression in freezing point of 0.1 M aqueous solutions of HCl, CuSO4 and K2 SO4 are in the ratio
  • 1 : 1 : 1
  • 1 : 2 : 3
  • 1 : 1 : 1 : 5
  • 2 : 4 : 3
The ratio of the colligative property of NaCl solution to that of the glucose solution of the same molality is about
  • 0.5
  • 1
  • 1.5
  • 2
Which of the following compounds corresponds to van’t Hoff factor (i) to be equal to 2 for dilute solution?
  • K2SO4
  • NaHSO4
  • Sugar
  • MgSO4
Which of the following is a colligative property?
  • Surface tension
  • Viscosity
  • Osmotic pressure
  • boiling point
The solubility of a gas increases in a liquid with
  • increase of temperature
  • reduction of gas pressure
  • decrease in temperature
  • amount of liquid taken
Which of the following aqueous solution has the highest freezing point?
  • 0.1 M HCl
  • 0.05 M sucrose
  • 0.1 M glucose
  • 0.1 M NaCl
From the diagram given below, which compound would be most apt to be easily purified by recrystallization from water?
Chemistry-Solutions-7054.png
  • NaCl
  • KCl
  • KBr
  • KNO3
At 25oC, the highest osmotic pressure is exhibited by 0.1 M solution of
  • CaCl2
  • KCl
  • Glucose
  • Urea
The depression in freezing point for 1 M urea, 1M glucose and 1 M NaCl are in the ratio.
  • 1 : 2 : 3
  • 3 : 2 : 2
  • 1 : 1 : 2
  • None of these
Which of the following is correctly matched?
Chemistry-Solutions-7055.png
  • (a)
  • (b)
  • (c)
  • (d)
Normality of a 2 M sulphuric acid is
  • 2N
  • 4N
  • N/2
  • N/4
How many grams of a diabasic acid (Mol. wt. =should be present in 100 ml of its aqueous solution to give decinormal strength?
  • 1g
  • 2g
  • 10g
  • 20g
An aqueous solution of glucose is 10% in strength. The volume in which one gram mole of it is dissolved will be
  • 18 litres
  • 9 litres
  • 0.9 litres
  • 1.8 litres
A molal solution of sodium chloride has a density of 1.21g ml-1. The molarity of this solution is
  • 4.15
  • 1.143
  • 2.95
  • 3.15
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